high working efficiency material: 304, 316 ,316L , Hastelloy c,HastelloyB ,17-7PH 20#alloy nonstandard Applicable working condition 1,The pressure of sealed chamber: 1.2Mpa 2,The temperature of sealed chamber: -40-220°C 3,Medium : water, oil, weak acid ,weak base and other general corrosive liquidDescription 1,The small spring with uniform spring force,it can be operated under the high rotate ...